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The structure that primarily delivers oxygenated blood to the body is the aorta. After oxygen-rich blood is pumped from the left ventricle of the heart, it enters the aorta, which is the largest artery in the body. The aorta branches out into smaller arteries that distribute blood to various parts of the body, ensuring that tissues and organs receive the oxygen and nutrients they need for proper functioning.

While the left ventricle plays a crucial role in pumping oxygenated blood into the aorta, it is the aorta that serves as the main conduit for delivering that blood throughout the body. The pulmonary veins transport oxygenated blood from the lungs to the left atrium, but they do not play a direct role in systemic distribution. The right atrium is involved in receiving deoxygenated blood from the body, which is not the focus of the question. Thus, the aorta is confirmed to be the correct answer as it is key to the distribution of oxygenated blood.